When you use either of those methods to upload the site attempts to create a title and an identifier based on (I believe) the first uploaded file. Perhaps the filename "jfjo2012-04-28.2496" is the problem.

The period in the filename may be the problem... Try replacing it with an underscore.

(BTW... there seems to be a colon after the filename. Hopefully it's just in the text in your post and not part of the filename)